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Influence of KH-550 Silane Treatment on the Corrosion Resistance of AZ31 Magnesium Alloy

机译:KH-550硅烷处理对AZ31镁合金耐蚀性的影响

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摘要

Silane treatment is an effective method of chemical conversion as a replacement for chromium treatments. In this paper, KH-550 silane treatment was adopted to improve the corrosion resistance AZ31 magnesium alloy. Hydrolysis process of KH-550 in the silane solutions was detected by the conductivity detection method. It was found that KH-550 silane could be hydrolyzed easily and its hydrolysis time was about 10 minutes. Polarization curve and salt immersion were carried out to investigate the corrosion behavior of the coated magnesium alloy treated by five kinds of silane solutions with different silane concentrations. When the concentration of KH-550 in the silane solution was 8%, the coated specimens by heating at 100°C for half an hour after the surfaces dry had more excellent corrosion resistance than others. It was shown that the KH-550 silane treatment could form a -Si-O-M covalent bonded film/metal interface and -Si-O-Si siloxane chains to improve the corrosion resistance of coated magnesium alloy.
机译:硅烷处理是一种有效的化学转化方法,可以代替铬处理。本文采用KH-550硅烷处理工艺来改善AZ31镁合金的耐蚀性。用电导检测法检测KH-550在硅烷溶液中的水解过程。发现KH-550硅烷易于水解,并且其水解时间为约10分钟。通过极化曲线和盐浸法研究了五种不同硅烷浓度的硅烷溶液对镁合金涂层的腐蚀行为。当硅烷溶液中KH-550的浓度为8%时,表面干燥后在100°C加热半小时后得到的涂层标本比其他样品具有更好的耐腐蚀性。结果表明,KH-550硅烷处理可以形成-Si-O-M共价键膜/金属界面和-Si-O-Si硅氧烷链,从而提高了涂层镁合金的耐蚀性。

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